// enums/EnumMaps.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// Basics of EnumMaps
// {java enums.EnumMaps}
package enums;

import java.util.EnumMap;
import java.util.Map;

import static enums.AlarmPoints.*;

interface Command {
    void action();
}

public class EnumMaps {
    public static void main(String[] args) {
        EnumMap<AlarmPoints, Command> em =
                new EnumMap<>(AlarmPoints.class);
        em.put(KITCHEN,
                () -> System.out.println("Kitchen fire!"));
        em.put(BATHROOM,
                () -> System.out.println("Bathroom alert!"));
        for (Map.Entry<AlarmPoints, Command> e :
                em.entrySet()) {
            System.out.print(e.getKey() + ": ");
            e.getValue().action();
        }
        try { // If there's no value for a particular key:
            em.get(UTILITY).action();
        } catch (Exception e) {
            System.out.println("Expected: " + e);
        }
    }
}
/* Output:
BATHROOM: Bathroom alert!
KITCHEN: Kitchen fire!
Expected: java.lang.NullPointerException
*/
